JP5690938B2 - Method and apparatus for transmitting traffic in a communication network - Google Patents

Description

  The present invention relates to a method for transmitting traffic in a communication network. The invention also relates to a communication network transmission element. The invention also relates to a communication network element. The present invention also relates to a communication network. The invention also relates to a method for framing transmission traffic in a communication network. The invention also relates to a method for controlling the transmission of traffic in a communication network.

  Increasing attention is being focused on improving the power efficiency of electrical products in both consumer products and professional products. Telecom operators are beginning to specify the minimum power efficiency for the products they purchase, and communications standards bodies are beginning to adopt features that improve power efficiency. So far, communication transmission products have not been addressed effectively, and many of them consume the same amount of power regardless of the amount of transport traffic. For example, in packet networks, transponders occupy most of the required power consumption and use the same amount of power regardless of whether the contents of the optical channel payload unit (OPU) contain empty packets or full packets. . Burst mode transmission has been proposed to reduce power consumption when little traffic is carried by turning off transmitters between bursts. However, this requires additional overhead to synchronize the clock and burst. Furthermore, burst mode transmission is not compatible with most installed wavelength division multiplexing (WDM) communication network infrastructures designed for continuous transmission. For example, erbium-doped fiber amplifiers and power monitors used in optical transmission networks are generally unsuitable for performing burst mode transmission.

  It is an object of the present invention to provide an improved method for transmitting traffic in a communication network. It is a further object of the present invention to provide an improved communication network transmission element. It is a further object of the present invention to provide an improved communication network element. It is a further object of the present invention to provide an improved communication network. It is a further object of the present invention to provide an improved method for framing transmission traffic in a communication network. It is a further object of the present invention to provide an improved method for controlling the transmission of traffic in a communication network.

  A first aspect of the invention provides a method for transmitting traffic in a communication network. The method comprises receiving a client signal having a client bit rate and including transmitted traffic, and monitoring an indicator indicating the client bit rate. The method further comprises setting a transmission bit rate for transmitting traffic. The transmission bit rate is set depending on the client bit rate. The method further comprises generating and transmitting a control signal configured to transmit traffic at a transmission bit rate by the transmitting device.

  In response to receiving a client signal having a client bit rate below the maximum transmission bit rate that can transmit traffic over the network, the method may reduce the transmission bit rate. A decrease in the transmission bit rate will reduce the power consumption during the transmission of traffic. Depending on the method, the power consumption may be varied to match the received traffic load. The method may be able to continue to transmit traffic at a transmission bit rate that is continuous but lower than the maximum for the capacity of the network or transmitter, so the method can be used in combination with the currently installed wavelength division multiplexing network infrastructure. Good.

  In one embodiment, the transmission bit rate is set by determining a division ratio for the master bit rate depending on the client bit rate. The control signal includes a clock signal generated by receiving a master clock signal at a master bit rate and dividing the master clock signal by a division ratio. This may provide a simple mechanism for setting the transmission bit rate and generating the control signal. Although the transmission bit rate varies by changing the division ratio, the master clock signal has a constant master bit rate. This will facilitate clock recovery at a receiver that can operate at a constant bit rate locked to the input signal.

  In one embodiment, the bit rate is set by selecting a split rate from a set of split rates depending on the amount of traffic. This would further simplify the operation of the method, as it is only necessary to select one appropriate split rate from the set of split rates rather than determining the split rate. In one embodiment, the intermediate bit rate may be set by periodically switching between each of a plurality of split rates selected from the set of split rates. The intermediate bit rate includes an average of transmission bit rates at the division ratio.

  In one embodiment, the method has a first client bit rate and receives a first client signal that includes transmitted first traffic, and then has a second client bit rate and Receiving a second client signal including second traffic to be transmitted. The first transmission bit rate is set by monitoring an indicator that indicates the first client bit rate, and the second transmission bit rate is set by monitoring an indicator that indicates the second client bit rate. . The method further comprises generating and transmitting a first control signal and a second control signal. The first control signal is configured to frame the first traffic into one or more first frames at a first transmission bit rate by the framer. A second control signal configured to frame the second traffic into one or more subsequent frames at a second transmission bit rate by the framer. When the second transmission bit rate is different from the first transmission bit rate, the second control signal realizes a change from the first transmission bit rate to the second transmission bit rate at the frame boundary by the framer. Further configured. Changing the bit rate only at the frame boundary may ensure that a clean transition from the first transmission bit rate to the second transmission bit rate is achieved, from the first frame to the subsequent frame. Traffic outflow may be prevented.

  In one embodiment, the first control signal is configured to frame a portion of the first traffic in the payload of the first frame by a framer. The first control signal is further configured to provide information indicating a second transmission bit rate in the overhead of the first frame by a framer. Thus, a receiver that receives traffic may be ready to track changes in the transmission bit rate and receive traffic at different transmission bit rates.

  In one embodiment, the frame includes an optical transmission network frame. In one embodiment, the optical transport network frame is an ITU-T recommendation G.264. 709 includes an optical transmission network frame as defined by 709. In one embodiment, the control signal is transmitted by a framer to one of bytes 15 of either row 1 or 2 of overhead of the first frame, one of bytes 13 to 15 of row 3 of overhead of the first frame. , And one of one of the first frame overhead row 4 bytes 9-14 and 16 is configured to provide information indicative of a second transmission bit rate. Thus, information is normally allocated for alignment control, but bytes 16 in rows 1-4 are not needed in this method because alignment control is only needed when sending constant bit rate traffic. It may be provided with any usable byte of overhead that is not used in combination with the transmission of the including traffic.

  In one embodiment, the control signal is configured to provide the information indicating a second transmission bit rate in a first plurality of the bytes by a framer. The first plurality of bytes is arranged in the second plurality of rows of overhead. This may provide redundancy against transmission errors.

  In one embodiment, the information indicating the second transmission bit rate includes the second bit rate being a master bit rate, a master bit rate of 1/2, a master bit rate of 1/3, and a master bit rate of 1/4. It includes a plurality of bits encoded to indicate that one of them is included.

  In one embodiment, the information indicating the second transmission bit rate is 001 indicating the master bit rate, 0.10 indicating the master bit rate of 1/2, 100 and 1/4 indicating the master bit rate of 1/3. 3 bits encoded as one of 110 indicating the master bit rate of.

  In one embodiment, the method further comprises receiving transmission traffic at the receiver device and determining whether a transmission bit rate value is available. If the value of the transmission bit rate is unavailable, the method further comprises generating and transmitting a recovery signal by a further transmission device. The recovery signal is configured to transmit traffic at a default transmission bit rate by the transmitting device. Therefore, the reverse direction information may be transmitted from the receiver apparatus to the transmission apparatus, and notify the transmission apparatus of a decrease in the bit rate of the receiver apparatus. By transmitting traffic at the default transmission bit rate, it will be easier to regain synchronization of the transmission bit rate and the frame at the receiver device. In one embodiment, the recovery signal is configured to retransmit traffic on the transmission signal at a default transmission bit rate by the remote transmission device. Thus, the risk of losing traffic whose transmission bit rate was not available at the receiver device would be reduced.

  In one embodiment, the recovery signal is transmitted at a predetermined recovery signal transmission bit rate. The method comprises framing the recovery signal in the payload of the frame, and providing the recovery signal identifier in the frame overhead. In one embodiment, the recovery signal identifier includes two bits encoded as 10.

  In one embodiment, the receiver apparatus comprises a receiver soft decision and equalizer, and the method further comprises providing a transmission bit rate to the receiver soft decision and equalizer. This will make it easier to predict threshold levels for soft decisions and equalizers.

  In one embodiment, the method comprises receiving each of the client signals at an input traffic queue buffer and monitoring the rate at which the queue buffer is filled. In one embodiment, the rate at which the queue buffer is filled is monitored by monitoring when the queue buffer fill level reaches a threshold fill level. In one embodiment, the input traffic queue buffer includes a first in first out buffer. Using a queue buffer will reduce delay variation because traffic is transmitted at a higher transmission bit rate when the input traffic queue is filled.

  In one embodiment, the indicator includes a client bit rate signal that indicates the client bit rate. In one embodiment, the client bit rate signal is received from a network management system. In one embodiment, the communication network includes an optical transmission network. The transmission bit rate is determined by the optical channel transmission unit clock rate. In one embodiment, the communication network includes a synchronous digital hierarchical network. The transmission bit rate is determined by the network synchronous transmission module.

In one embodiment, the communication network is an optical packet network.
In one embodiment, the method deframes received transmission traffic and holds the deframed traffic in a queuing buffer until all packets of traffic are received, and then outputs the deframed traffic. Delivering to the client signal interface. If the received transmission traffic has a transmission bit rate lower than the output client signal bit rate, this may prevent packet underrun.

  In one embodiment, the method further comprises obtaining a temperature of the transmitting device, and the division ratio is further set depending on the temperature. As the transmission bit rate decreases depending on the ambient temperature, the power required to cool the transmitting device will decrease. Thus, the method may be used such that the transmission bit rate decreases when the ambient temperature increases above a threshold. This may be realized when the client bit rate is below the maximum transmission bit rate capability of the transmitting device.

  A second aspect of the present invention provides a communication network transmission element comprising an input unit, a client signal monitoring device, a transmission bit rate control device, and a transmission device. The input is configured to receive a client signal having a client bit rate and including transmitted traffic. The client signal monitoring device is configured to monitor an indicator indicating the client bit rate. The transmission bit rate control device is configured to set a transmission bit rate for transmitting the received traffic. The transmission bit rate is set depending on the client bit rate. The transmission bit rate control device is further configured to generate and transmit a control signal configured to transmit traffic at the transmission bit rate by the transmission device. The transmitting device is configured to receive the control signal and generate and transmit a transmission signal that carries the traffic.

  The transmitting element may perform a decrease in the transmission bit rate in response to receiving a client signal having a client bit rate that is below the maximum transmission bit rate capability of the transmitting element. A reduction in the transmission bit rate will reduce the power consumption in the transmitting element, particularly the transmitting device. Accordingly, the power consumption of the transmitting element may vary to match the received traffic load. The transmitting element can continue to transmit traffic at a transmission bit rate that is continuous but less than maximum capability. Thus, the transmission element may be used within a currently installed wavelength division multiplexing network infrastructure.

  In one embodiment, the transmission bit rate control apparatus includes a controller, a clock, and a divider. The controller is configured to determine a split ratio depending on the client bit rate. The clock is configured to generate a master clock signal having a master bit rate. The divider is configured to receive the division ratio and divide the master clock signal by the division ratio to form a control signal. Thus, the transmission bit rate control device may operate with a simple mechanism that sets the transmission bit rate and generates the control signal. Although the transmission bit rate varies by changing the division ratio, the master clock signal has a constant master bit rate. This will facilitate clock recovery at a receiver that can operate at a constant bit rate locked to the input signal.

  In one embodiment, the split rate is set from a set of split rates depending on the amount of traffic. This would further simplify the operation of the transmission bit rate controller, since it is only necessary to select one appropriate division rate from the set of division rates instead of determining the division rate. In one embodiment, the controller is configured to set the bit rate at an intermediate bit rate by periodically switching between each of a plurality of split rates selected from the set of split rates. The intermediate bit rate includes an average of the bit rates at the division ratio.

  In one embodiment, the input unit receives a first client signal having a first client bit rate and including transmitted first traffic, and then has a second client bit rate and It is configured to receive a second client signal that includes the second traffic to be transmitted. The transmission device includes a framer. The transmission bit rate controller is configured to set the first transmission bit rate depending on the first client bit rate for transmitting the first traffic. The transmission bit rate controller is configured to set the second transmission bit rate depending on the second client bit rate for transmitting the second traffic. The transmission bit rate control device generates and transmits a first control signal configured to frame the first traffic into one or more first frames at the first transmission bit rate by the framer. Further configured. The transmission bit rate controller is further configured to generate and transmit a second control signal configured to frame the second traffic into one or more subsequent frames at the second transmission bit rate by the framer. Composed. When the second transmission bit rate is different from the first transmission bit rate, the second control signal realizes a change from the first transmission bit rate to the second transmission bit rate at the frame boundary by the framer. Further configured. By changing the transmission bit rate only at the frame boundary, it may be ensured that a clean transition from the first transmission bit rate to the second transmission bit rate is achieved. Traffic outflow to the traffic may be prevented.

  In one embodiment, the first control signal is configured to frame a portion of the first traffic in the payload of the first frame by a framer. The first control signal is further configured to provide information indicative of the second transmission bit rate in the overhead of the first frame by the framer. Thus, a receiver that receives traffic may be ready to track changes in the transmission bit rate and receive traffic at different transmission bit rates.

  In one embodiment, the frame is an optical transport network frame. In one embodiment, the optical transport network frame is an ITU-T recommendation G.264. 709 includes an optical transmission network frame as defined by 709. In one embodiment, the control signal is transmitted by a framer to one of bytes 15 of either row 1 or 2 of overhead of the first frame, one of bytes 13 to 15 of row 3 of overhead of the first frame. , And one of one of the first frame overhead row 4 bytes 9-14 and 16 is configured to provide information indicative of a second transmission bit rate. Thus, information is normally allocated for alignment control, but bytes 16 in rows 1-4 are not needed in this method because alignment control is only needed when sending constant bit rate traffic. It may be provided with any usable byte of overhead that is not used in combination with the transmission of the including traffic.

  In one embodiment, the control signal is configured to provide the information indicating a second transmission bit rate in a first plurality of the bytes by a framer. The first plurality of bytes is arranged in the second plurality of rows of overhead. This may provide redundancy against transmission errors.

  In one embodiment, the information indicating the second transmission bit rate includes the second bit rate being a master bit rate, a master bit rate of 1/2, a master bit rate of 1/3, and a master bit rate of 1/4. It includes a plurality of bits encoded to indicate that one of them is included. In one embodiment, the information indicating the second bit rate includes 001 indicating a master bit rate, 0.10 indicating a master bit rate of 1/2, 100 and 1/4 indicating a master bit rate of 1/3. Includes 3 bits encoded as one of 110 indicating the master bit rate.

  In one embodiment, the client signal monitoring device is configured to monitor an indicator that indicates a client bit rate. In one embodiment, the client signal monitoring device includes an input traffic queue buffer. The client signal monitoring device is configured to monitor the rate at which the queue buffer is filled. In one embodiment, the client signal monitoring device is configured to monitor when the queue buffer fill level reaches a threshold fill level. In one embodiment, the input traffic queue buffer includes a first in first out buffer. By providing a queuing buffer, delay variation within the network element will be reduced because traffic is transmitted at a higher transmission bit rate when the input traffic queue is filled.

  In one embodiment, the client signal monitoring device is configured to monitor a client bit rate signal indicative of the client bit rate. In one embodiment, the client bit rate signal is provided by a network management system.

  In one embodiment, the communication network transmission element further comprises a receiver configured to receive the recovery signal. The recovery signal is configured to transmit a transmission signal carrying traffic at a default transmission bit rate by the transmitter device. Thus, the reverse direction information may be received, for example, from a remote transmission device at a further transmission element to notify the transmission element of a decrease in the transmission bit rate of the receiver device at the remote transmission element. Sending traffic at the default transmission bit rate will make it easier to regain transmission bit rate and frame synchronization at the remote transmission element. In one embodiment, the recovery signal is configured to retransmit traffic on the transmission signal at a default transmission bit rate by the transmitter device. Thus, the risk of losing traffic whose transmission bit rate was not available at the remote transmission element would be reduced.

  In one embodiment, the communication network includes an optical transmission network. The transmission bit rate is determined by the optical channel transmission unit clock rate. In one embodiment, the communication network includes a synchronous digital hierarchical network. The synchronous digital hierarchical network is an ITU-T recommendation G.264. It may be an SDH network as defined by 707 and other ITU-T recommendations or a SONET network as defined by the American National Standards Institute (ANSI) standard. The transmission bit rate is determined by the network synchronous transmission module.

  In one embodiment, the communication network transmission element comprises an optical packet communication network transmission element.

  In one embodiment, the communication network transmission element further comprises a thermometer configured to measure the temperature of the transmission device, and the transmission bit rate controller is further configured to set the division ratio depending on the temperature. Is done. As the transmission bit rate decreases depending on the ambient temperature, the power required to cool the transmitting device will decrease. Thus, the transmission bit rate may be reduced to control the power required by the cooling device when the ambient temperature rises above the threshold. The transmission bit rate control device may realize this when the client bit rate is below the maximum transmission bit rate capability of the transmission device. A third aspect of the present invention provides a communication network element including an input unit, a transmission signal inquiry device, and a local transmission device. The input is configured to carry a traffic and receive a transmission signal having a transmission bit rate. The transmission signal interrogation device is configured to determine whether the value of the transmission bit rate is usable. The transmission signal interrogation device is further configured to generate a recovery signal configured to transmit a transmission signal carrying traffic at a default transmission bit rate by the remote transmission device when the transmission bit rate value is unavailable. The The local transmission device is configured to transmit a recovery signal.

  Thus, the network element may, for example, provide reverse information to the remote transmitting device at the further network element, so that the network element notifies the transmitting device of the reduced bit rate. By transmitting traffic at the default transmission bit rate by the remote transmission device, it will be easier to regain synchronization of the transmission bit rate and the frame at the network element.

  In one embodiment, the recovery signal is configured to retransmit traffic on the transmission signal at a default transmission bit rate by the remote transmission device. Thus, the risk of losing traffic whose transmission bit rate was not available at the network element would be reduced.

  In one embodiment, the local transmission device is configured to transmit a recovery signal at a predetermined recovery signal transmission bit rate. . The local transmitter is configured to frame the recovery signal in the payload of the frame and provide the recovery signal identifier in the frame overhead. In one embodiment, the recovery signal identifier includes two bits encoded as 10.

  In one embodiment, the receiver device comprises a receiver soft decision and equalizer, and the transmission signal monitoring device is further configured to provide a transmission bit rate to the receiver soft decision and equalizer. This will make it easier to predict threshold levels for soft decisions and equalizers.

  In one embodiment, the communication network element further includes a deframer and a queue buffer. The deframer is configured to receive transmission signals and deframe traffic. The queuing buffer is configured to receive and hold deframed traffic until all packets of traffic are received, and then send the deframed traffic to the output client signal interface.

  A fourth aspect of the present invention provides a communication network comprising a communication network transmission element as described above.

  The communication network may perform the transmission bit rate reduction in response to receiving a client signal at a transmission element having a client bit rate that is below the maximum transmission bit rate capability of the transmission element. A reduction in the transmission bit rate will reduce the power consumption in the transmitting element, particularly the transmitting device. Accordingly, the power consumption of the transmitting element may vary to match the received traffic load. Thus, traffic transmission can continue to transmit traffic at a transmission bit rate that is continuous across the network but lower than the maximum capacity of the network or the transmitting device in the network.

  In one embodiment, the communication network further comprises a communication network element as described above. Thus, reverse information from the network element to the transmitting element may be provided so that the network element notifies the transmitting device at the transmitting element that the bit rate has decreased. By transmitting traffic at the default transmission bit rate by the transmitting device at the transmitting element, it will be easy to regain synchronization of the transmission bit rate and the frame at the network element.

  A fifth aspect of the present invention provides a method for framing transmission traffic in a communication network. The method comprises receiving a first client signal having a first client bit rate and including transmitted first traffic. The first client signal is transmitted at a first transmission bit rate. The method further comprises receiving a second client signal having a second client bit rate and including transmitted second traffic. The second client signal is transmitted at the second transmission bit rate. The method further comprises generating and transmitting a control signal. The control signal is configured to frame a portion of the first traffic in the payload of the frame by the framer. The control signal is further configured to provide information indicative of the second transmission bit rate in the frame overhead by the framer.

Accordingly, information indicating the transmission bit rate for subsequent frames may be sent with the first frame that may allow the receiver device to be ready to receive traffic at the subsequent transmission bit rate.

  In one embodiment, the method further comprises monitoring an indicator indicative of the first client bit rate and an indicator indicative of the second client bit rate. The method further comprises setting a first transmission bit rate as a function of the first client bit rate, and setting a second transmission bit rate as a function of the second client bit rate. .

  Accordingly, the transmission bit rate may decrease in response to receiving a client signal having a client bit rate that is below the maximum transmission bit rate that can transmit traffic across the network. A decrease in the transmission bit rate will reduce the power consumption during the transmission of traffic. Depending on the method, the power consumption may be varied to match the received traffic load. Because the method may allow continuous traffic transmission at a transmission bit rate that is continuous but lower than the maximum for the network, the method may be used in combination with the currently installed wavelength division multiplexing network infrastructure.

  In one embodiment, the frame includes an optical transmission network frame. In one embodiment, the optical transport network frame is an ITU-T recommendation G.264. 709 includes an optical transmission network frame as defined by 709. In one embodiment, the control signal is transmitted by the framer in either byte 15 of either row 1 and 2 of the first frame overhead, one of bytes 13-15 in row 3 of the first frame overhead, and It is configured to provide information indicative of the second transmission bit rate in one of one of bytes 9-14 and 16 of row 4 of the overhead of the first frame. Thus, information is normally allocated for alignment control, but bytes 16 in rows 1-4 are not needed in this method because alignment control is only needed when sending constant bit rate traffic. It may be provided with any usable byte of overhead that is not used in combination with the transmission of the including traffic.

  In one embodiment, the control signal is configured to provide the information indicating a second transmission bit rate in a first plurality of the bytes by a framer. The first plurality of bytes is arranged in the second plurality of rows of overhead. This may provide redundancy against transmission errors.

  In one embodiment, the information indicating the second transmission bit rate includes the second bit rate being a master bit rate, a master bit rate of 1/2, a master bit rate of 1/3, and a master bit rate of 1/4. It includes a plurality of bits encoded to indicate that one of them is included. In one embodiment, the information indicating the second transmission bit rate is 001 indicating the master bit rate, 0.10 indicating the master bit rate of 1/2, 100 and 1/4 indicating the master bit rate of 1/3. 3 bits encoded as one of 110 indicating the master bit rate of.

  In one embodiment, the method comprises receiving each of the client signals at an input traffic queue buffer and monitoring the rate at which the queue buffer is filled. In one embodiment, the rate at which the queue buffer is filled is monitored by monitoring when the queue buffer fill level reaches a threshold fill level. In one embodiment, the input traffic queue buffer includes a first in first out buffer. Using a queue buffer will reduce delay variation because traffic is transmitted at a higher transmission bit rate when the input traffic queue is filled.

  In one embodiment, the indicator includes a client bit rate signal that indicates the client bit rate. In one embodiment, the client bit rate signal is received from a network management system.

  A sixth aspect of the present invention provides a method for controlling transmission of traffic in a communication network. The method comprises receiving a transmission signal that carries traffic and has a transmission bit rate. The method further comprises determining whether a transmission bit rate value is available. If the value of the transmission bit rate is not available, the method comprises transmitting a recovery signal by the local transmitter device. The recovery signal is configured to transmit traffic at a default transmission bit rate by the remote transmission device.

  Therefore, the reverse direction information may be sent from the local transmission device to the remote transmission device to notify the remote transmission device that the bit rate is unusable for the transmission signal. By sending traffic at the default transmission bit rate by the remote transmission device, it will be easy to regain synchronization of the transmission bit rate and the frame.

  In one embodiment, the recovery signal is configured to retransmit traffic on the transmission signal at a default transmission bit rate by the remote transmission device. Therefore, the risk of losing traffic where the transmission bit rate was not available will be reduced.

  In one embodiment, the method further comprises transmitting a recovery signal at a predetermined recovery signal transmission bit rate. The method comprises framing the recovery signal in the payload of the frame and providing the recovery signal identifier in the frame overhead. In one embodiment, the recovery signal identifier includes two bits encoded as 10.

  In one embodiment, the communication network includes either an optical transmission network or a synchronous digital hierarchical network. The transmission bit rate is determined by one of an optical channel transmission unit clock rate, an optical channel data unit clock rate, and an optical channel payload unit clock rate. In one embodiment, the communication network includes a synchronous digital hierarchical network. The transmission bit rate is determined by the network synchronous transmission module. A seventh aspect of the present invention provides a data storage medium including computer readable instructions. The computer readable instructions provide access to resources available on the processor. The computer readable instructions include instructions for performing any of the above-described steps of a method for transmitting traffic in a communication network by a processor.

  An eighth aspect of the present invention provides a data storage medium containing computer readable instructions. The computer readable instructions provide access to resources available on the processor. The computer readable instructions include instructions for performing any of the above-described steps of a method for framing transmission traffic in a communication network by a processor.

  A ninth aspect of the present invention provides a data storage medium comprising computer readable instructions. The computer readable instructions provide access to resources available on the processor. The computer readable instructions include instructions that cause a processor to perform any of the above-described steps of a method for controlling transmission of traffic in a communication network.

FIG. 1 is a diagram illustrating the steps of a method for transmitting traffic in a communication network according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating the steps of a method for transmitting traffic in a communication network according to a second embodiment of the present invention. FIG. 3 is a diagram illustrating the steps of a method for transmitting traffic in a communication network according to a third embodiment of the present invention. FIG. 4 illustrates steps of a method for transmitting traffic in a communication network according to a fifth embodiment of the present invention. FIG. 5 shows steps of a method for transmitting traffic in a communication network according to a sixth embodiment of the present invention. FIG. 6 is a diagram illustrating an optical transmission network frame. FIG. 7 shows steps of a method for transmitting traffic in a communication network according to an eighth embodiment of the present invention. FIG. 8 shows steps of a method for transmitting traffic in a communication network according to a tenth embodiment of the present invention. FIG. 9 shows steps of a method for transmitting traffic in a communication network according to a twelfth embodiment of the present invention. FIG. 10 shows steps of a method for transmitting traffic in a communication network according to a thirteenth embodiment of the present invention. FIG. 11 is a schematic diagram illustrating a communication network transmission element according to the fifteenth embodiment of the present invention. FIG. 12 is a schematic diagram illustrating a communication network transmission element according to a sixteenth embodiment of the present invention. FIG. 13 is a schematic diagram illustrating a communication network transmission element according to an eighteenth embodiment of the present invention. FIG. 14 is a schematic diagram showing communication network elements according to the twentieth embodiment of the present invention. FIG. 15 is a schematic diagram showing communication network elements according to the twenty-first embodiment of the present invention. FIG. 16 is a schematic diagram showing communication network elements according to the twenty-second embodiment of the present invention. FIG. 17 is a schematic diagram showing a communication network according to the twenty-third embodiment of the present invention. FIG. 18 is a schematic diagram showing a communication network according to the twenty-fourth embodiment of the present invention. FIG. 19 shows steps of a method for framing transmission traffic in a communication network according to a twenty-fifth embodiment of the present invention. FIG. 20 shows steps of a method for framing transmission traffic in a communication network according to a twenty-sixth embodiment of the present invention. FIG. 21 is a diagram illustrating method steps for controlling transmission of traffic in a communication network according to a twenty-eighth embodiment of the present invention. FIG. 22 shows steps of a method for controlling transmission of traffic in a communication network according to a twenty-ninth embodiment of the present invention.

FIG. 1 shows the steps of a method 10 for transmitting traffic in a communication network according to a first embodiment of the invention.
The method 10 includes receiving a client signal having a client bit rate and including transmitted traffic (12) and monitoring an indicator indicating the client bit rate (14). The method 10 further includes setting (16) a transmission bit rate for transmitting traffic. The transmission bit rate is set depending on the client bit rate. A control signal configured to transmit traffic at a transmission bit rate is generated and transmitted by the transmitting device (18).

  This method may be applied to any kind of communication network, including optical transport networks (OTN) and synchronous digital hierarchy (SDH) networks.

  The client signal may include a single signal that carries the transmitted traffic, or it may include a collection of signals that each carry the transmitted traffic. Thus, the client bit rate may include a single signal bit rate or a total bit rate of multiple aggregate signals.

  The transmission bit rate indicates the rate at which the transmitting device transmits a single stream of traffic. Thus, the control signal controls the actual rate at which the transmitting device transmits traffic, which can be realized in a time division multiplex (TDM) transmission in which multiple streams of traffic are transmitted in different time slots. It is not a reasonable transmission bit rate. The effective transmission bit rate for a traffic stream is feasible in TDM transmission and differs from the rate at which traffic is transmitted in each time slot, i.e. the rate at which the transmitting device transmits data, Depends on the number and allocation of time slots transmitted.

  In response to receiving a client signal having a client bit rate below the maximum transmission bit rate at which traffic can be transmitted across the network, this method may reduce the transmission bit rate. By reducing the transmission bit rate when the transmission device transmits traffic, the power consumption of the transmission device during transmission of traffic can be reduced. Therefore, the power consumption of the transmission device can be varied to match the received traffic load. This method allows continuous traffic transmission at a transmission bit rate that is continuous but lower than the maximum for the capacity of the network or transmitter, so that it can be used in conjunction with the currently installed wavelength division multiplexing network infrastructure. can do.

  The steps of a method 20 for transmitting traffic in a communication network according to the second embodiment of the invention are shown in FIG. Method 20 is similar to method 10 of FIG. 1 and includes the following variations. The same reference numerals are retained for the corresponding steps.

  In this embodiment, the transmission bit rate is set by determining the division rate for the master bit rate depending on the client bit rate (22). The control signal includes a clock signal generated by receiving the master clock signal at the master bit rate and dividing the master clock signal by the division ratio (24). Next, the control signal is transmitted to the transmission device, and traffic is transmitted at the transmission bit rate set by the transmission device (26).

  This may provide a simple mechanism for setting the transmission bit rate and generating the control signal. Although the transmission bit rate varies by changing the division ratio, the master clock signal has a constant master bit rate. This will facilitate clock recovery at a receiver that can operate at a constant bit rate locked to the input signal.

  The steps of a method 30 for transmitting traffic in a communication network according to a third embodiment of the invention are shown in FIG. Method 30 is similar to method 20 of FIG. 2 and includes the following variations. The same reference numerals are retained for the corresponding steps.

  In this embodiment, the transmission bit rate is set by selecting a division rate from a set of division rates depending on the client bit rate (32). This would further simplify the operation of the method, as it is only necessary to select one appropriate split rate from the set of split rates rather than determining the split rate.

  In the fourth embodiment, the step of selecting a division rate further includes selecting a plurality of division rates from the set of division rates. The intermediate transmission bit rate may be set by periodically switching between each of the selected division rates. The intermediate transmission bit rate is the average of the transmission bit rates at the selected division rate.

  The steps of a method 40 for transmitting traffic in a communication network according to the fifth embodiment of the invention are shown in FIG.

  The method 40 receives (42) a first client signal having a first client bit rate and including transmitted first traffic, and then has a second client bit rate and transmits. Receiving (44) a second client signal including the second traffic to be performed. The first transmission bit rate is set depending on the first client bit rate (46), and the second transmission bit rate is set depending on the second client bit rate (48). A first control signal is generated and transmitted, and the first control signal is configured to frame the first traffic into one or more first frames at a first transmission bit rate by a framer. (50). A second control signal is generated and transmitted, and the second control signal is configured to frame the second traffic into one or more subsequent frames at a second transmission bit rate by the framer (52 ). When the second transmission bit rate is different from the first transmission bit rate, the second control signal realizes a change from the first transmission bit rate to the second transmission bit rate at the frame boundary by the framer. Further configured. By changing the transmission bit rate only at the frame boundary, it may be ensured that a clean transition from the first transmission bit rate to the second transmission bit rate is achieved. Traffic outflow to the traffic may be prevented.

  FIG. 5 shows the steps of a method 60 for transmitting traffic in a communication network according to a sixth embodiment of the present invention. The method 40 of this embodiment is similar to the method 40 of the previous embodiment and includes the following variations. The same reference numerals are retained for the corresponding steps.

  In this embodiment, the first control signal is configured to frame the first traffic in the payload of one or more first frames by the framer (62). The first control signal is further configured to provide information indicative of the second transmission bit rate in the overhead of the first frame by the framer (62). Thus, a receiver that receives traffic may be ready to track changes in the transmission bit rate and receive traffic at different transmission bit rates.

  In the seventh embodiment of the invention, the frame into which the traffic is framed is an optical transport network (OTN) frame. ITU-T Recommendation G. A schematic diagram of an OTN frame that satisfies the requirements of 709 is shown in FIG.

  The OTN frame 70 includes four rows 72, each containing 4080 bytes (columns) 74. Bytes 1-14 in each row include optical channel transmission unit (OTU) overhead and optical channel data unit (ODU) overhead 76. Each row of bytes 15 and 16 includes an optical channel payload unit (OPU) overhead 78. Payload 80 of frame 70 includes bytes 17-3824 of each row, and forward error correction (FEC) information 82 is assigned to bytes 3825-4080 of each row.

In this example, the information indicating the second transmission bit rate may be provided in any available byte of overhead that is not used in combination with the transmission of traffic. In particular, this information may be provided in one of the bytes 15 in either row 1 or 2, one of bytes 13-15 in row 3, and one of bytes 9-14 and 16 in row 4. Good.
Redundancy against transmission errors may be provided by using more than one byte in row 72 of overhead 76,78.

  The information indicating the second transmission bit rate is one in which the second bit rate is a master bit rate, a master bit rate of 1/2, a master bit rate of 1/3, and a master bit rate of 1/4. It includes a plurality of bits encoded to indicate inclusion.

  In this example, 001 indicates a master bit rate, 0.10 indicates a master bit rate of 1/2, 100 indicates a master bit rate of 1/3, and 110 indicates a master bit rate. Used to indicate master bit rate.

  FIG. 7 shows the steps of a method 90 for transmitting traffic in a communication network according to an eighth embodiment of the present invention. The method 90 of this embodiment is similar to the method 10 of FIG. 1 and includes the following variations. The same reference numerals are retained for the corresponding steps.

  In this embodiment, the method 90 further includes receiving transmission traffic at the receiver device (92) and determining whether a transmission bit rate value is available (94). If the transmission bit rate value is not available, the method further includes generating and transmitting (96) a recovery signal by a further transmission device. The recovery signal is configured to transmit traffic at a default transmission bit rate by the transmitting device. Therefore, the reverse direction information may be transmitted from the receiver apparatus to the transmission apparatus, and notify the transmission apparatus of a decrease in the bit rate of the receiver apparatus. By transmitting traffic at the default transmission bit rate, it will be easier to regain synchronization of the transmission bit rate and the frame at the receiver device.

  The ninth embodiment of the present invention provides a method for transmitting traffic in a communication network having the same method steps as the previous embodiments, and includes the following variations. In this embodiment, the recovery signal is configured to retransmit traffic on the transmission signal at a default transmission bit rate by the remote transmission device. Therefore, the risk of losing traffic will be reduced as traffic with unavailable bit rates is retransmitted.

  The steps of a method 100 for transmitting traffic in a communication network according to a tenth embodiment of the present invention are shown in FIG. The method 100 of this embodiment is similar to the method 90 of FIG. 7 and includes the following variations. The same reference numerals are retained for the corresponding steps.

  In this embodiment, the further transmitting device is configured to generate a recovery signal configured to transmit traffic at a default transmission bit rate by the transmitting device (102). The recovery signal is framed in the payload of the frame and the recovery signal identifier is provided in the overhead of the frame (104). The recovery signal is transmitted at a predetermined recovery signal transmission bit rate (104). The eleventh embodiment of the present invention provides a method for transmitting traffic in a communication network similar to the method 100 of the previous embodiment. The method of the present embodiment comprises the same steps as method 100, and the recovery signal identifier includes two bits encoded as 10 provided in the overhead of the frame (104).

  FIG. 9 shows the steps of a method 110 for transmitting traffic in a communication network according to a twelfth embodiment of the present invention. The method 110 of this embodiment is similar to the method 10 of FIG. 1 and includes the following variations. The same reference numerals are retained for the corresponding steps.

  The indicator indicating the client bit rate includes a client bit rate signal. The method of this embodiment comprises receiving a client bit rate signal indicative of a client bit rate from a network management system.

  FIG. 10 shows steps of a method 300 for transmitting traffic in a communication network according to a thirteenth embodiment of the present invention. The method 300 of this embodiment is similar to the method 10 of FIG. 1 and includes the following variations. The same reference numerals are retained for the corresponding steps.

  In this embodiment, the client bit rate is determined by receiving a client signal at the incoming traffic queue buffer (302) and monitoring the rate at which the buffer is filled (304).

The transmission bit rate is set depending on the filling rate (306).
Using a queue buffer will reduce delay variation because traffic is transmitted at a higher transmission bit rate when the input traffic queue is filled.

  The fourteenth embodiment of the present invention provides a method for transmitting traffic in a communication network similar to the method 300 of FIG.

  In this embodiment, the rate at which the queue buffer is filled is monitored by monitoring when the queue buffer fill level reaches a threshold.

  The fifteenth embodiment of the present invention provides a method for transmitting traffic in a communication network similar to the method 20 of FIG. The method of the present embodiment includes the same steps as method 20, and the step of determining the division ratio further includes obtaining the temperature of the transmitter, and the division ratio is set depending on the temperature. As the transmission bit rate decreases depending on the ambient temperature, the power required to cool the transmitting device will decrease. Thus, the method may be used such that the transmission bit rate decreases when the ambient temperature increases above a threshold.

  Referring to FIG. 11, a sixteenth embodiment of the present invention provides a communication network transmission element 120. The communication network transmission element 120 includes an input unit 122, a client signal monitoring device 126, a transmission bit rate control device 128, and a transmission device 130.

  The input 122 is configured to receive a client signal 124 having a client bit rate and including transmitted traffic. The client signal monitor 126 is configured to monitor an indicator that indicates a client bit rate and to send a client bit rate signal 134 to the transmission bit rate controller. The transmission bit rate controller 128 is configured to set a transmission bit rate for transmitting received traffic. The transmission bit rate is set depending on the client bit rate as indicated by the client bit rate signal 134. The transmission bit rate controller is further configured to generate and transmit a control signal 136 configured to transmit traffic at the transmission bit rate by the transmitter 130. The transmitter 130 is configured to receive the control signal 136 and generate and transmit a transmission signal 132 that carries the traffic.

  The transmitting element 120 may reduce the transmission bit rate in response to receiving a client signal having a client bit rate that is below the maximum transmission bit rate capability of the transmitting element. In this way, the power consumption of the transmitting device may be reduced and varied to match the received traffic load. The transmitting element 120 can transmit traffic at a transmission bit rate that is continuous but less than maximum capability. Accordingly, the transmitting element 120 may be used within a currently installed WDM network infrastructure.

  As shown in FIG. 12, the seventeenth embodiment of the present invention provides a communication network transmission element 140. The transmitting element 140 is similar to the transmitting element 120 of FIG. 10 and includes the following variations. The same reference numerals are retained for the corresponding functions.

  In this embodiment, the transmission element 140 is an ITU-T recommendation G.264. Including the source termination of an optical transmission network (OTN) as defined by 709.

  Source termination 140 includes a client signal interface 142 configured to receive a client signal having a client bit rate and including transmitted traffic. Client signal interrogator 126 includes a queue buffer, which in this example takes the form of a first in first out (FIFO) buffer that is configured to receive client signals from client signal interface 142. When the client signal is received at the FIFO buffer 126, the filling level of the buffer is monitored, and when the filling level reaches the threshold, the filling level signal 127 that has reached the threshold is transmitted to the transmission bit rate controller 128.

  In this example, the transmission bit rate control device 128 includes a controller 144, a clock 146, and a divider 148. The controller 144 is configured to receive the fill level signal 127 and determine the split rate depending on the fill level. The clock 146 is configured to generate a master clock signal 147 having a master bit rate. Divider 148 is configured to receive divide ratio signal 145 from controller 144 and divide master clock signal 147 by the divide ratio to form control signal 156.

  The transmission device 130 includes an adaptation layer 150, for example, a generalized framing procedure (GFP), a framer 152, and a modulator 154. The adaptation layer 150 is configured to receive transmission traffic from the FIFO buffer 126 and prepare traffic for framing by the framer 152 including jitter removal and addition of data provided in frame overhead.

  Although the transmission bit rate varies by changing the division ratio depending on the filling level, the master clock signal 147 has a constant master bit rate.

  In this example, the split rate selected from the set of split rates depending on the fill level is selected from that set provided in the controller 144.

  As shown in FIG. 13, an eighteenth embodiment of the present invention provides a communication network transmission element 160. The transmit element 160 of this embodiment again includes an OTN source termination, is similar to the source termination 140 of FIG. 12, and includes the following variations. The same reference numerals are retained for the corresponding functions.

  In this embodiment, the source termination 160 receives a first client signal 166 that has a first client bit rate and includes the first traffic to be transmitted, and then has a second client bit rate. And configured to receive a second client signal 167 that includes transmitted second traffic. The controller 144 is configured to set the first transmission bit rate as a function of the first client bit rate for transmitting the first traffic. This is performed by the controller 144 that determines the split rate depending on the fill level signal 127 received from the FIFO buffer 126 for the first client signal. The controller 144 is similarly configured to determine a split ratio for the second client signal 167 to set a second transmission bit rate for transmitting the second traffic. The clock signal 147 is divided by a first division ratio, and a first control configured to frame the first traffic into one or more first frames by the framer 152 at the first transmission bit rate. Signal 168 is provided. The clock signal 147 is then divided by a second division ratio and a second control signal configured to frame the second traffic into one or more subsequent frames at a second transmission bit rate by the framer. 169 is generated.

  When the second transmission bit rate is different from the first transmission bit rate, the second control signal 169 realizes a change from the first transmission bit rate to the second transmission bit rate at the frame boundary by the framer 152. Further configured to. Changing the bit rate only at the frame boundary may ensure that a clean transition from the first transmission bit rate to the second transmission bit rate is achieved, from the first frame to the subsequent frame. Traffic outflow may be prevented.

  The controller 144 may be further configured to generate and transmit a bit rate code signal 151 indicative of the first transmission bit rate and the second transmission bit rate transmitted to the framer 152.

  The first control signal 168 is configured to frame the first traffic in the payload of one or more first frames by the framer 152. The first control signal is further configured to provide information indicative of the second transmission bit rate by the framer 152 in at least one first frame overhead.

  Source termination 160 further comprises a receiver 162 configured to receive recovery signal 164. The recovery signal is configured to transmit a transmission signal carrying traffic at a default transmission bit rate by the transmitter 130. With the recovery signal, framer 152 frames the traffic at the default transmission bit rate.

  Thus, the source termination 160 can receive reverse direction information from the remote transmission device that is transmitting traffic carrying the signal 152, and the remote transmission device can notify the source termination 160 of the reduced bit rate.

  In the nineteenth embodiment, the source termination 160 may further comprise a thermometer configured to measure the temperature of the source termination 160, which may be ambient temperature. The controller 144 is configured to receive a temperature signal from a thermometer indicating the ambient temperature, and is further configured to set a split ratio depending on the temperature. Thus, the transmission bit rate may decrease depending on the ambient temperature where the temperature exceeds the threshold, which is desirable to reduce the amount of cooling required for the source termination. This may be performed when the client bit rate is below the maximum transmission bit rate capability of the transmitting device.

  As shown in FIG. 14, a twentieth embodiment of the present invention provides a communication network element 170.

  The communication network element 170 includes an input unit 172, a transmission signal inquiry device 176, and a local transmission device 178. Input unit 172 is configured to receive transmission signal 174 carrying traffic having a transmission bit rate. The transmission signal interrogator 176 is configured to determine whether a transmission bit rate value is available. If the value is not available for the transmission bit rate, the transmission signal interrogator generates a recovery signal 180 configured to transmit a transmission signal carrying traffic at the default transmission bit rate by the remote transmission device. Further configured. Local transmitter 178 is configured to transmit recovery signal 180.

  Thus, the communication network element 170 may provide reverse information to the remote transmission device, for example in a further network element, so that the network element notifies the transmission device of the reduced bit rate. By transmitting or retransmitting traffic at the default transmission bit rate by the remote transmission device, it will be easier to regain synchronization of the transmission bit rate and the frame at the network element 170.

  FIG. 15 shows a communication network element 190 according to the twenty-first embodiment of the present invention. Communication network element 190 is similar to network element 170 of FIG. 14 and includes the following variations. The same reference numerals are retained for the corresponding functions.

  The communication network element 190 of this embodiment is an ITU-T recommendation G.264. Include OTN sink termination as defined by 709.

  Sink termination 190 includes a receiver soft decision equalizer 192 configured to receive transmission signal 174. The receiver 192 is configured to convert the received optical signal into an electrical signal and transmit it to the deframer 194. The deframer 194 is configured to send the traffic to an adaptation layer 196 that is configured to deframe the traffic and remove overhead and send the traffic to the queue buffer 198. The queue buffer 198 is configured to receive and hold deframed traffic until all packets of traffic are received. The traffic is then sent to an output client signal interface configured to convert the traffic to an output client signal for forward transmission or processing.

  The deframer 194 retrieves information from the frame overhead associated with the transmission bit rate for subsequent frames and sends the bit rate code signal 206 to the transmission signal interrogator 176 that is configured to store the transmission bit rate for future reference. Configured to do.

  Upon receiving a transmission signal 124 carrying traffic, the transmission signal interrogator 176 is configured to determine whether a value of the transmission bit rate for the signal is available. If the transmission bit rate has not been previously received or has decreased, the transmission signal interrogator 176 is configured to generate the recovery signal 180 as described above.

  In this example, the transmission signal interrogator 176 is further configured to determine a split ratio for generating the control signal 208 for the deframer 194. The division rate is set according to the bit rate, and the division rate control signal 209 is transmitted to the divider 204. The control signal 208 for the deframer is generated by dividing the clock signal generated by the master clock 202 by the division ratio.

  A communication network element 210 according to a twenty-second embodiment of the present invention is shown in FIG. The network element 210 of this embodiment is similar to the network element 170 of FIG. 13 and includes the following modifications. The same reference numerals are retained for the corresponding functions.

  In the present embodiment, the local transmission device 178 is configured to transmit the recovery signal 212 at a predetermined recovery signal transmission bit rate. The local transmitter 178 is configured to frame the recovery signal in the payload of the frame and provide the recovery signal identifier in the frame overhead. The recovery signal identifier includes two bits encoded as 10.

The twenty-third embodiment of the present invention provides a communication network 220 as shown in FIG.
The communication network 220 includes a communication network transmission element 120 as shown in FIG. 11, a transmission link 222, and a communication network element 170 as shown in FIG.

FIG. 18 shows a communication network 230 according to the twenty-fourth embodiment of the present invention.
The communication network 230 includes a source termination 140 as shown in FIG. 12, a transmission link 232, and a sink termination 190 as shown in FIG.

A twenty-fifth embodiment of the present invention provides a method 240 for framing transmission traffic in a communication network. The steps of method 240 are shown in FIG.
The method 240 receives a first client signal that includes a first traffic having a first client bit rate and transmitted at a first transmission bit rate (242); and a second client bit rate And receiving (244) a second client signal comprising second traffic transmitted at a second transmission bit rate. The method further includes generating and transmitting a control signal (246). The control signal is configured to frame a portion of the first traffic in the payload of the frame by the framer. The control signal is further configured to provide information indicative of the second transmission bit rate in the frame overhead by the framer.

  Accordingly, information indicating the transmission bit rate for subsequent frames may be sent with the first frame that may allow the receiver device to be ready to receive traffic at the subsequent transmission bit rate.

The steps of a method 250 for framing transmission traffic in a communication network according to a twenty-sixth embodiment of the present invention are shown in FIG.
The method 250 receives (252) a first client signal having a first client bit rate and including first traffic to be transmitted, and has a second client bit rate and is transmitted. Receiving (254) a second client signal including second traffic. The method sets (256) a first transmission bit rate for transmitting the first traffic in dependence on the first client bit rate and routes the second traffic in dependence on the second client bit rate. Setting (258) a second transmission bit rate for transmission.

  The method 250 further includes generating and transmitting (260) a control signal configured to frame a portion of the first traffic in the payload of the frame by the framer. The control signal is further configured to provide information indicating a second transmission bit rate in the frame overhead by the framer (260).

  Accordingly, the transmission bit rate may decrease in response to receiving a client signal having a client bit rate that is below the maximum transmission bit rate that can transmit traffic across the network. A decrease in the transmission bit rate will reduce the power consumption during the transmission of traffic. Depending on the method, the power consumption may be varied to match the received traffic load. Because the method may allow continuous traffic transmission at a transmission bit rate that is continuous but lower than the maximum for the network, the method may be used in combination with the currently installed wavelength division multiplexing network infrastructure.

In the twenty-seventh embodiment of the present invention, as described above with reference to FIG. 6, the frame in which the traffic is framed is an optical transport network (OTN) frame.
Information indicating the second transmission bit rate may be provided in any available bytes of overhead that are not used in combination with the transmission of traffic. In particular, this information may be provided in one of the bytes 15 in either row 1 or 2, one of bytes 13-15 in row 3, and one of bytes 9-14 and 16 in row 4. Good.
Redundancy against transmission errors may be provided by using more than one byte in row 72 of overhead 76,78.

  The information indicating the second transmission bit rate is one in which the second bit rate is a master bit rate, 1/2 of the master bit rate, 1/3 of the master bit rate, and 1/4 of the master bit rate. It includes a plurality of bits encoded to indicate inclusion.

  In this example, 001 indicates the master bit rate, 010 indicates 1/2 of the master bit rate, 100 indicates 1/3 of the master bit rate, and 110 indicates 1 / of the master bit rate. Used to indicate 4.

The steps of a method 270 for controlling transmission of traffic in a communication network according to a twenty-eighth embodiment of the present invention are shown in FIG.
Method 270 comprises receiving a transmission signal that carries traffic and has a transmission bit rate (272). The method further includes determining whether a transmission bit rate value is available. If the value of the transmission bit rate is not available, the method includes transmitting a recovery signal (276) by the local transmitter device. The recovery signal is configured to transmit traffic at a default transmission bit rate by the remote transmission device.

  Therefore, the reverse direction information may be sent from the local transmission device to the remote transmission device to notify the remote transmission device that the bit rate is unusable for the transmission signal. By sending traffic at the default transmission bit rate by the remote transmission device, it will be easy to regain synchronization of the transmission bit rate and the frame.

The steps of a method 280 for controlling transmission of traffic in a communication network according to a twenty-ninth embodiment of the present invention are shown in FIG.
The method 280 of the present embodiment is similar to the method 270 of the previous embodiment and includes the following variations. The same reference numerals are retained for the corresponding steps.
In this embodiment, the method includes causing the local transmitter to generate a recovery signal configured to transmit traffic at a default transmission bit rate by the remote transmitter (282). The recovery signal is framed in the payload of the frame, and the recovery signal identifier is provided in the frame overhead (284). The recovery signal is transmitted at a predetermined recovery signal transmission bit rate (284).

  A thirtieth embodiment of the present invention provides a data storage medium including computer readable instructions. The computer readable instructions provide access to resources available on the processor. The computer readable instructions include instructions that cause a processor to perform any of the method steps for transmitting traffic in a communication network according to the first to thirteenth embodiments described above.

  The data storage medium may include a memory device such as a compact disc, a digital versatile disc or electronic memory, or a communication signal.

A thirty-first embodiment of the present invention provides a data storage medium that includes computer-readable instructions. The computer readable instructions provide access to resources available on the processor. The computer readable instructions include instructions that cause a processor to perform any method steps for framing transmission traffic in a communication network according to the twenty-third to twenty-fifth embodiments described above.
The data storage medium may include a memory device such as a compact disc, a digital versatile disc or electronic memory, or a communication signal.

A thirty-second embodiment of the present invention provides a data storage medium that includes computer-readable instructions. The computer readable instructions provide access to resources available on the processor. The computer readable instructions include instructions that cause a processor to perform any method steps that control transmission of traffic in a communication network in accordance with the twenty-sixth and twenty-seventh embodiments described above.
The data storage medium may include a memory device such as a compact disc, a digital versatile disc or electronic memory, or a communication signal.

Claims (28)

A method for transmitting traffic in a communication network, comprising:
Receiving a client signal having a client bit rate and including transmitted traffic;
Monitoring an indicator indicating the client bit rate;
Setting a transmission bit rate that is set depending on the client bit rate for transmitting the traffic;
Generating and transmitting a control signal configured to transmit the traffic at the transmission bit rate by a transmitting device.   The transmission bit rate is set by determining a division ratio with respect to a master bit rate depending on the client bit rate, and the control signal receives a master clock signal at the master bit rate and receives the master clock signal. The method of claim 1, further comprising a clock signal generated by dividing by the division ratio. Receiving a first client signal having a first client bit rate and including the first traffic to be transmitted, and then second traffic having a second client bit rate and transmitted. Receiving a second client signal comprising:
Setting a first transmission bit rate depending on the first client bit rate, and setting a second transmission bit rate depending on the second client bit rate;
A first control signal configured to frame the first traffic into one or more first frames by the framer at the first transmission bit rate and at the second transmission bit rate by the framer. Generating and transmitting a second control signal configured to frame the second traffic into one or more subsequent frames, wherein the second transmission bit rate is the first transmission bit. If different from the rate, the second control signal is further configured to realize a change from the first transmission bit rate to the second transmission bit rate at a frame boundary by the framer. 3. A method according to claim 1 or 2, characterized by comprising.   The first control signal includes information indicating the part of the first traffic in the payload of the first frame by the framer and indicating the second transmission bit rate in the overhead of the first frame. The method of claim 3, wherein the method is configured to provide.   The method of claim 4, wherein the first frame comprises an optical transport network frame.   Receiving transmission traffic at a receiver device and determining whether the value of the transmission bit rate is usable, and if the value of the transmission bit rate is not available, a default transmission bit by a further transmission device; 6. The method according to any one of claims 1 to 5, further comprising causing the transmitter to generate and transmit a recovery signal configured to transmit traffic at a rate.   The method of claim 6, wherein the recovery signal is configured to retransmit the traffic on a transmission signal at the default transmission bit rate by the remote transmission device.   The recovery signal is transmitted at a predetermined recovery signal transmission bit rate and includes framing the recovery signal in a payload of a frame and providing a recovery signal identifier in the overhead of the frame. Item 8. The method according to Item 6 or 7.   9. The method of claim 1, comprising receiving each of the client signals at an input traffic queue buffer and monitoring a rate at which the queue buffer is filled. the method of.   9. A method as claimed in any preceding claim, wherein the indicator comprises a client bit rate signal. An input having a client bit rate and configured to receive a client signal including traffic to be transmitted;
A client signal monitoring device configured to monitor an indicator indicative of the client bit rate;
A control signal configured to set a transmission bit rate that is set depending on the client bit rate for transmitting the received traffic, and configured to transmit the traffic at the transmission bit rate by a transmission device; A transmission bit rate controller further configured to generate and transmit;
A transmitter configured to receive the control signal and to generate and transmit a transmission signal carrying the traffic;
A communication network transmission element comprising:   The transmission bit rate control device includes a controller configured to determine a division ratio depending on the client bit rate, a clock configured to generate a master clock signal having a master bit rate, and 12. A communication network transmission element according to claim 11, comprising a divider configured to receive a division ratio and to divide the master clock signal by the division ratio to form the control signal.   The input unit receives a first client signal having a first client bit rate and including first traffic to be transmitted, and then has a second client bit rate and is transmitted. Configured to receive a second client signal including two traffics, wherein the transmission device comprises a framer, and the transmission bit rate control device is configured to transmit the first traffic to the first client bit rate. A first transmission bit rate is set dependently, and a second transmission bit rate is set dependent on the second client bit rate for transmitting the second traffic, the framer The first traffic is configured to be framed into one or more first frames at the first transmission bit rate. Generating and transmitting a second control signal configured to frame the second traffic into one or more subsequent frames at the second transmission bit rate by the generated first control signal and the framer And when the second transmission bit rate is different from the first transmission bit rate, the second control signal is derived from the first transmission bit rate at a frame boundary by the framer. 13. A communication network transmission element according to claim 11 or 12, further configured to realize a change to the second transmission bit rate.   The first control signal includes information indicating the part of the first traffic in the payload of the first frame by the framer and indicating the second transmission bit rate in the overhead of the first frame. The communication network transmission element of claim 13, wherein the communication network transmission element is configured to provide.   15. A communication network transmission element according to claim 13 or 14, wherein the first frame comprises an optical transmission network frame.   16. A communication network transmission element according to any one of claims 11 to 15, wherein the client signal monitoring device is configured to monitor a client bit rate signal indicative of the client bit rate.   16. The client signal monitoring device of any one of claims 11 to 15, wherein the client signal monitoring device includes an input traffic queue buffer and is configured to monitor the rate at which the queue buffer is filled. Communication network transmission element.   17. The receiver according to any one of claims 11 to 16, further comprising a receiver configured to receive a recovery signal configured to transmit a transmission signal carrying traffic at a default transmission bit rate by the transmitting device. A communication network transmission element according to claim 1. An input configured to carry traffic and receive a transmission signal having a transmission bit rate;
It is configured to determine whether the transmission bit rate value is usable, and when the transmission bit rate value is not usable, a transmission signal carrying traffic at a default transmission bit rate is transmitted by a remote transmission device. A transmission signal interrogation device further configured to generate a recovery signal configured as described above,
A local transmitter configured to transmit the recovery signal;
A communication network element comprising:   The communication network element of claim 19, wherein the recovery signal is configured to retransmit the traffic on a transmission signal at the default transmission bit rate by the remote transmission device.   The local transmission device is configured to transmit the recovery signal at a predetermined recovery signal transmission bit rate, frame the recovery signal in a payload of a frame, and provide a recovery signal identifier in the overhead of the frame 21. A communication network element according to claim 19 or 20, further configured. A communication network transmission element according to any one of claims 11 to 18;
A communication network element according to any one of claims 19 to 21;
A communication network comprising: A method of framing transmission traffic in a communication network,
Receiving a first client signal comprising first traffic having a first client bit rate and transmitted at a first transmission bit rate;
Receiving a second client signal comprising second traffic having a second client bit rate and transmitted at a second transmission bit rate;
Generating and transmitting a control signal configured to frame a portion of the first traffic in a payload of a frame by a framer and to provide information indicating the second transmission bit rate in the overhead of the frame When
Monitoring indicators indicating the first client bit rate and the second client bit rate;
Setting the first transmission bit rate depending on the first client bit rate, and setting the second transmission bit rate depending on the second client bit rate; A method characterized by comprising:   The method of claim 23, wherein the frame comprises an optical transmission network frame. A method for controlling traffic transmission in a communication network, comprising:
Receiving a transmission signal carrying traffic and having a transmission bit rate;
Determining whether the value of the transmission bit rate is usable;
Including causing a local transmitter device to transmit a recovery signal configured to transmit traffic at a default transmission bit rate by a remote transmitter device when the value of the transmission bit rate is unavailable. . 26. The method of claim 25 , wherein the recovery signal is configured to retransmit the traffic on a transmission signal at the default transmission bit rate by the remote transmission device.   Further comprising: transmitting the recovery signal at a predetermined recovery signal transmission bit rate; framing the recovery signal in a payload of a frame; and providing a recovery signal identifier in the overhead of the frame. The method according to claim 25 or 26.   28. The method of claim 27, wherein the frame comprises an optical transmission network frame.

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